By the



Aug. 9, 1932. w, s, v N v Re. 18,564

ELECTRIC PERCOLATOR Original Filed Sept. 4. 1928 2 Sheets-Sheet l Icy-L I I E /79 1? Jul/m QWZZ Aug. 9, 1932. w, 5. MARVlN Re. 18,564

ELECTRIC PERCOLATOR Origixial Filed Sept. 4, 1928 2 Sheets-Sheet 2 j'zaenzior l ir 6? mm, W by He flkzal Il/e As's'ynee (E/W w a Reiuued Aug. 9, 1932 I TA warmmus. mvm',mncmssn, LATE or Twowrsooitsnijny-rrm mmn wean coarom'mou, or rwo. arm s wzsconsm, assrezma 1 H nmc'rme saucepan)? V tofigmarmrrsmseo; dated June re, 1931, sefi'ai K0. sometimes septeinter 4, 192B.

. reissue'-flled June'S, 1932Cer1al11o, 616,289."

This invention relates to electric percolaand the bolt is slipped into place." fThreafter' tom." Objects of this invention aret'o provide a noveliormof heater of the immersion type fonan eleet'ric pereolator, which is so con-' 5 struoted that-the heat is directly conducted fromthe heating elementto the shell-of-the heater, and in which novel" means are"pro-" vided fon rigidly lockingthe heater in place'j andsitnultaneously locking the base to the pot 1-1: hr body'qiortion of the 'percolator.

Further objects are to-provide'a novel con-' struo'ti oh for insulating 1 the outgoing leads from-the heater at the point where'they pass 2 ily together and alsothe heater-is hel'drigidly- V in place.- A steel shield: plate is held by gr through the bottom shell below the heater, 1; so that bare conductor strips may'beused without an danger of contact with the metal portions 0 the'apparatus. 1

An embodiment of the invention is shown in the accompanying'drawings, inwhich I I sing cOre- 18 which is preferably 5 imuy,

' Figure lis a fra" mentary side elevation of a percolator, showmg the heater in section, and'with-parts broken away."

withthe bottomcap'and associated parts in sectioni-"-' I Refe'rtingto the"drawings','it will'be seen thatthe body portion; or pot,'-is indicated'by the reference character lyand 'tha'tthis pot is provided: with a bottom 2;" The base 3 is providedwvith a" transverse walls. The bottom and transverse walls are provided with alin-.

ing apertures.

The immersion type heater consists of ah inverted eiip 5 which may be slightly swelled or enlarged, as at the point 6. It is provided iis'a'bottom'view of the perc'o'lator with= hebottom shield plate broken away and element."

"A lication tor" the flangeis swaged, or tunied -up,--so as to l lock the bolt head rigidly to the 'top'of the H inverted cup 5; The bolt extends downward;

ly and passes throughxthe inverted :oap 13,

and is provided with'a niit 'l i which "is screwed tightly against the underside of the cap. This cap is of greater-diameter-than' the extension Set the cup, andconseqnentlyl" telescopically receives the extension and bears tt *againstethe under side of the transversewall 41 of the base Thus the base and the pot are'locked-rigid-i the boltin contact with a shouldered portion 1 16 of the base; It is locked in placeby means of thenut 17. J.

Theheater is provided'with a heat resist-4' grooved and which receives the spira led' or coiled heating element 19. One end of the heating-elementis connected to the conduc i tor 20 which leads downwardly from the virprr per end of the core 18 as indicated in Fight-e170 i 1. The other end-of the *hea'tin'g' element is connected to the conductor 21, which is adjacent the lower portion of'the core-1'8 and 3 which extends-through the recess and down wardly as shown. i 1

Preferably the conductors '20v and 121 are? extensions oftheheating element, although-i obviouslythey may be additional members" weld'edior otherwise secured to theflheatingw The space between the core and the invert f 1 ed cup 5 is filled by an-insulating filling 22 which is preferably put in while in condition and allowed to harden in place.

Thus the heat froml-the heating 'elemen t'i's directly conducted through the filling to-the' finverted'cup' 5. In addition to this,-the fill;

' ing rigidly holds-the heating element in place and prevents sagging or displacement there'-' contact with the shell and with its inwardly projecting apertured arms extend into the openings 23. This insulating bushing is held in place by means of a rivet 25 which is passed through the member 13 and riveted in place.

The base is provided with a shell or cuplike receptacle 26 for the reception of a plug. A pair of prongs 27 are carried by the base within this cuplikeireceptacle, and are insulated from the base. A pair of metal.

strips 28 and 29 are secured by means of nuts to the inner ends of the prongs, as shown in Figure 2, and extend through the openings in the insulating bushing 24. Their inner ends are provided with enlarged portions 30 which are transversely slotted or provided with a series of transverse straps 31.

The conductors 20 and 21 are slipped between the successive straps, as shown in Figures 1 and 2, and thus are rigidly mechanical- 1y connected and electrically connected to t e enlar portions 30 of the straps 28 and 29. Pre erably these enlarged portions are bent at ri ht angles, as shown in Figures 1 and 2, to t us provide extensive bearing surface in contact with the conductors 20 and 21 and also to more firmly lock such conductors in place against inadvertent withdrawal.

locking the straps 28 and 29 to the mner'ends of the prongs, it is possible to use-bare metallic straps without any insulation whatsoever. This'has been found to be a material improves anentover the usual construction as there is no possible chance of charring the insulating covering for these conductors as they are free from such covering. Further it materially simplifies the construction and provides a reliable, chea and easily produced means of attaching t e heater to the prongs.

It will be seen that a novel form of electric immersion type of heater has been provided by this invention, which may be very easily constructed, which is easy to assemble, and which permits the ready replacement of one heating element by a new heating element whenever burning out through extensive use occurs. Further it may be appreciated that by having the heat directly connected from the heating element through the filling 22, the chance of burning out is very much reduced.

What is claimed is f 1. In an electric percolator, the combination of a pot having a bottom, a base having a transverse wall, said bottom and said wall having aligning apertures, an electric heatmg unit cup mounted on said bottom in said pot and having an extension projecting provided with a pair of By providing the bushing 24 and by rigidly verse wall, a shield plate carried by the base and spaced from the transverse wall of the base, a bolt carried by the upper end of the heatin unit cup and extending downwardly throug' the cap and shield plate, a nut carried by the bolt adjacent its outer end and locking said cap in place, and a second nut on the outer end of said bolt engaging the outer face of the shield plate to retain the same in position in the base.

2. In an electric percolator, the combination of a pot having a bottom, a base having a transverse wall, said bottom and said wall having aligning apertures, an inverted cup within the pot, an annular flange on the cup resting upon the bottom of the pot and an extension projecting through the aligning apertures, said cup having an opening in its upper end, a bolt extending through the opening in the cup with a head engaging the up per end thereof, an annular flan e on the olt adapted to. engage the underside of the upper end of the cup for retaining the bolt against movement with respect to the cup, an inverted cap bearing on the underside of the transverse j wall and havin an opening through which the bolt exten s, a nut on the boltfor locking said cap in place, and a heatingeleinent mounted on the bolt within the cup with an insulating filling between the cup and the heating element, and conductors I leading from the heatingelement out'through the inverted cap.

7 3.. In'an electric percolator, the combination of a pot having a bottom, a base having a transverse wall,.said bottom and said wall having aligning apertures, an inverted cup within the pot, an annular flange on the cup resting on the bottom of the pot, an extension on the cup downwardly of the flange and projecting through the said apertures beyond the lower face of said wall, a bolt extending through the cup with its headed end engaged with the cup, a cap mounted on the bolt and engaged over the extension of the cup and contacting the lower face of the Wall, and a nut adjustable on the bolt and adapted to engage the cap for retaining the bottom of the pot and said transverse wall on the base in intimate contacting relation between the cup flange and the cap.

4. In an electric percolator, the combination, of a pot having a bottom wall, a base having a transversetop wall, said walls having alining apertures, an emersion heater cup having an outer flange resting upon the bottom wall and having a downwardly extending portion passing through said alining apertures, a bolt secured to the top of said cup and having a downwardly ext-ending threaded portion, a bottom cap carried by said bolt,'a nut screwed upon said bolt and forcing said cap into contact with the under extending out-wardl side of said transverse wall, a refractory core surrounding said bolt, a heating element carried by said core, and an insulating packing cup, whereby said emersion heater is held rigidly in place and whereby heat is conducted directly from said heating element to said cup.

5. In an electric heating device, the combination of a pot having a wall provided with an opening, a cup mounted on said wall within said pot and having a peripheral flange engaging said wall and an apron on its outer en projecting through said opening, a retaining member positioned on the outside of the wall and opposing said flange, a bolt extending axially through the cup and connected with the inner end of said cup and through the cup and said retaining mem er, and means on said bolt for engaging said retaining member to force the same toward said peripheral flange, and an electrical heating element positioned within said cup around the bolt and engaging the outer wall of the cup.

6. In an electric heat-ing device, the combination of a pot having a bottom wall provided with an opening, a supporting base secured to said pot, an inverted cup mounted on said bottom wall within said pot and having a peripheral flange and a depending apron projecting through said bottom opening, a retaining member positioned below the bottom of said cup and opposing said flange, a bolt connected with the upper end of the cup and extending downwardly through the cup and the opening and said retaimng member, means on said bolt for engaging said retaining member to force the same toward the peripheral flange, and an electrical heating element within said cup and engaging the outer wall thereof.

7 In an electric heating device, the combination of a pot having a bottom wall provided with an opening, a supporting base secured to said pot, an inverted cup dis osed within said pot having a peripheral ange snugly engaging the inner face of the bottom and a depending apron projecting through the opening and snugly engaging the wall thereof, a cap positioned in said base opposing said flange snugly receiving the apron, a bolt connected with the upper end of the cup and extending axially therethrough and through the opening and cap, means on said bolt for engaging the cap to force the same toward the peripheral flange, and an electrical heating element positioned within the on around the bolt and engaging the outer wa l of the cup.

8. In an electric heating device, the combination of a pot having a bottom wall provided with an opening, a supporting base having a top enga ing the bottom wall and a shoulder spaced rom said top, an inverted cup mountedon said bottom wall within'said pot and having a-peripheralflange-snugly .engaging the innerv face of the bottom wall filling the space between said core and said and a depending apron projecting through thef opening and snugly engaging the wall thereof, 'a-retaining cap positioned within the base and opposingsaidflange and snugly receiving 'the'aproma bolt carried by the upper end of the cupand extending axially through the cup, the opening and the cap, means on said bolt for engaging said cap to force the same toward sald flange, a shield plate for the base engaging the shoulder, the bolt extending through the plate, means on the bolt for urging the shield plate on the shoulder, and an electrical heating element positioned within said cup and engaging the outer wall thereof.

9. In an electric heating device, the combination of a pot having a bottom wall provided with an opening, a supporting base secured to said pot, an inverted cup mounted on said bottom wall within said pot and having a peripheral flange and a depending apron projecting through said bottom opening, a retaining member positioned below the bottom of said cup and opposing said flange, a shield plate for the base, a bolt connected with the upper end of the cup and extending downwardly through the cup, the opening, said retaining member and through the shield plate, means on the bolt for engaging the retaining member and plate for urging the same respectively toward the peripheral flange and the base, and an electrical heating element within said cup and engaging the outer wall thereof.

10. In an electric heating device, the combination of a vessel having a bottom wall provided with an opening, a supporting base engaging the vessel, an inverted cup arranged within the vessel having a peripheral flange engaging the bottom wall around the openin and a depending apron extending through the opening, a retaining member positioned below the bottom wall and opposing said flange, a shield plate for the base, a bolt carried by the cup and extending downwardly through the cup, retaining member and shield plate, means on the bolt engaging the retaining member for urging the same toward the flange, means on the olt engaging the shield plate for holding the same in position, and an electrical heating element within said cup.

11. In an electrical heating device, the combination with a receptacle having a wall provided with an opening, a cup engaging said wall about the opening, a bolt connected with the upper end of the cup andextending axially through the cup and through the opening in said wall of the receptacle, an electrical heating element in the cup about the bolt and in close contact with the'inner face of the cup, and means on the bolt outconsin.

THE IETAL WARE CORPORATION, Assignees of Walter S. Marvin, Deceased,

a, nun-2R E. DRUM.

President. 

